Triple cam internal combustion motor



J n 16, 1931. c. A. TOCE ETAL 1,810,638

TRIPLE CAM INTERNAL COMBUSTION IOTOR Filed Nov. 10, 1928 3 Sheets-Sheet 1 June 16, 1931. c. A. TOCE ET AL 1,810,688

TRIPLE CAM INTERNAL COMBUSTION MOTOR Filed Nov. 10, 1928 3 Sheets-Sheet 2 June 16, 1931.

Filed Nov. 10, 192! 5 Sheets-Sheet 3 W 2 m 3/ 5 w 3 a Q n .l \\k\\\\ F\\\ 5 Q Ill 0 n. a

:1]: A 9 8 r\ 3 3 mm o o r a B k Patented June 16, 1931 UNITED. STATES PATENT orrlcr.

CHARLES A. r003 Am) ALEXANDER cum, on HOUSTON, Texas 'rmrnn can INTERNAL comnns'rron MOTOR Application filed november 10, 1928. Serial No. 318,326.

Our invention relates to an internal. com bnstionengine wherein the fuelvapor is partially compressed by the piston before being admitted to the explosion chamber.

5 v t is one of the objects of the invention to provide a plurality of radially disposed cylinders arranged to drive a crank shaft by camming action.

Another object is to provide a crank shaft 1 having three cam surfaces thereon with pistons arranged relative thereto, so that each piston will complete three power strokes for each revolution of the shaft.

. One of the objects is also to arrange two diametrically disposed istons upon the respective ends of a rigid riving rod.

Still another object is to arrange the easing, chambers, inlets and outlets in a compact structure, easily accessible and with the 29 minimum of moving arts.

Other and further 0 jects of our improved device will be readily apparent to those skilled in the art when the following description is considered in connection with the accompanying drawings which illustrate the device without defining the limits and wherein Fig. 1 is a central vertical section taken on the line 1-1 of Fig. 2.

Fig. 2 is a central vertical section taken at right angles to the section of Fig. 1 as indicated thereon by the section line 2-2.

Fig. 3 is a section looking in the direction ofthe arrows on the line 3-3 of Fig. 2.

K Fig. 4 is a section taken on the line 4-4 of Fig. 2.

The engine is simple in its construction and, as shown in Fig. 1, has a crank case or housing 1 of substantially rectangular cross section when embodied in a two cylinder construction as here illustrated. It is to be understood, however, that any number of cylinders may be utilized without departing from the inventive ideas which we are about to disclose. The housing 1 may be formed in two parts such as the case 2 and side plate 3, each of which may be formed with a cup-like extension 4 to receive a ball race or roller bearing 5, locking nut 6 and cap 7 forming a sup- 9 port for a crank shaft 8 and by which arbers 10,

r-angement the shaft 8 is firmly retained in a rotatable position. If desired, suitable lubrieating passages may be provided to the bearings 5 from the crank case 2.

Radially disposed about the housing 1 may be assembled a plurality of explosion chameach of which comprises a cylinder 11 having an outstanding base 12 adapted for attachment to the housing 1 by means of cap screws 13.. The cylinders may have suit- 3 able cooling fins 14, or a water cooling system may be provided. In each cylinder 11 a.

piston 15 is adapted to reciprocate. We have arranged a novel procedure in the operation of two cycle engines in that the fuel is not introduced into the crank case as is usual, but, as seen in Fig. 2, is drawn in from a carburetor 16 thru a passage 17 connecting with the inlet port 18 adjacent the inner end of the cylinder 11. 70

It will be noted that the cylinder 11 is closed with respect to the housing 1 by means of a partition or end Wall 20 having a suitable gland 21 to form a tight sliding fit with the drive rod 22, the operation of which will be later described. This partition 20 not only closes the base of the cylinder but connects with the flared side 23 of the cylinder to form a compression chamber 24. A passage leads from this chamber part way up the side of the cylinder 11 where it forms the inlet to the combustion chamber 26.

An appropriate outlet or exhaust port 27 is spaced opposite to, but slightly above the inlet 25. Thus assuming the piston is traveling upward, a charge of vapor is drawn into the base of the cylinder 11 after the inner end of the piston has passed above the inlet 18, and on the down or explosion stroke this charge is compressed in the chamber 24 and passage 25. As the piston travels further downward, it passes the exhaust port 27 a trifle before it reaches the inlet port 25, thus the combustion pressure has been relieved and the incoming vapor from the inlet 25 scavenges the cylinder, as it is being forced from the chamber 24 into the explosion chamber 26 by the continued downward movement of the piston, the inlet 18 having been closed shortly afterthe down stroke had started. As the u stroke is started first the inlet is closed an then the outlet 27 trapping the charge in the explosion chamber 26. The upper surface of the piston may be suitably contoured at 30 to deflect the incoming charge away from the exhaust port. A spark plug of standard construction is shown at 31. I

From the'foregoing description it will be seen that a partial compression of the vapor is obtained on the down stroke and the re mainder of the compression on the upstroke.

A lubricant may be incorporated in the fuel as is usual in two-cycle engines.

In the construction here illustrated a two cylinder engine is shown and the tie rod about to be described is adapted for use only'with this two cylinder type. Nhere more than two cylinders are employed the gland 21 guides each cam rod 22 in its reciprocating movement.

The drive rod 22 is restrained to a straight reciprocating motion by the gland 21 and below the partition 20 said rod is enlarged to form a tie. bar 35, best seen in Figs. 1 and 2.

This bar is of special construction in that it rigidly connects the two diametrically disposed piston rods 22 and is formed adjacent the rods 22 into two flat portions 36 which carry an axle 37 for a bearing roller 38. Toward its'center tliebar is formed into four spaced connecting posts 39, as seen from Fig. 3. On the crank shaft, or as it is here used, the camshaft 8, a suitable triple cam 40 has been keyed and is provided with three raising cam surfaces 41 and three intermediate lowering cam surfaces 42. These cams may be properly designed to form a smooth path of travel for the rollers 38, but will obviously vary in contour, depending on the length of stroke of the engine. It is, however, necessary that the cam 40 be so designed that the distance between diametrically opposite points on its surface is approximately constant, and equal to the distance between the contacting surfaces of the two rollers 38. Thus the bar 35 is compelled to reciprocate by the traveling of the rollers 38 on the cam surfaces 41 and 42. As here provided each piston will make three complete strokes for each revolution of the cam shaft 8.

We may provide thrust or guide bearings or rollers 45 adapted to bear against each of the four posts 39 and spaced apart sufficiently to permit the cam 40 to rotate between them. These bearings may be mounted on stub shafts 46 carried by arms 47 projecting from the housing 1. Any suitable lubricating arrangement may be provided for the cams and rollers.

Access to the crank case is had by removing the plate 3.

Fig. 4 shows a section of the cylinder 11 disclosing the manner in which the inlet passages 17 and 25 are formed thereon and indicates the outline of the compression chamber 20.

lVe have disclosed herein an embodiment of our present improvements which is believed to be entirely satisfactory and practical for the purpose in View. Nevertheless, it is to be understood that the several essential parts of the improved embodiment might be constructed in various other alternative forms, and it is accordingly to be understood that in the further development of the device that we reserve the privilege of resorting to all such legitimate changes therein as may be fairly embodied within the spirit and scope of the invention as claimed.

Having described our invention, what we desire to secure by Letters Patent is:

1. A two-cycle motor comprising a housing, a cam shaft therein, a cam on said shaft, a tie bar straddling said cam and adapted to compel rotation thereof, a series of braces for said tie bar to prevent lateral motion thereof, a piston disposed on each end of said bar, each of said pistons adapted to reciprocate between two compression chambers, inlets and outlets for each of said chambers and means to explode the compressed fuel in one of said chambers.

2. A motor, a casing, a drive shaft therein, a plurality of cams on said shaft, opposite cylinders on said casing, pistons in said cylinders, means rigidly connecting said pistons, and means on said connecting means co-operating with said cams to rotate said shaft, a brace member on each side of said first means to maintain said means in alignment, said member having rolling contact with said means.

In testimony whereof, we have hereunto affixed our signatures, this 4th day of November, A. D, 1928.

CHARLES A. TOCE. ALEXANDER CLARK. 

